The volume of a cone is 108 pi cubic inches. Its height is 4 inches. What is the radius of the cone? Round the answer to the nearest tenth if necessary.

Use the cone volume formula, V = (1/3)πr²h. Substituting V = 108π and h = 4 gives 108π = (4/3)πr², so r² = 81 and r = 9 inches. The radius is positive, so the correct choice is 9 in.

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